An inter-frame demodulation system for CDMA receivers with heavy interference canceling function

A new signal demodulation system for CDMA receivers is proposed. This system has an effective function of canceling the interference noise components in the received symbol frames. For a target symbol frame to be detected, the differential frames are produced, each of which is made by subtracting one of the neighboring symbol frames from the target frame. The interference noise being left in some of the differential frames is much less than that in the target frame. By demodulating only such noise cancelled differential frames that have been estimated with an analyzing sequence, the information conveyed on the target frame with a heavy interference can be detected. The simulation indicates effective canceling performance for all the possible interference disturbance is achieved.